1. Section of Gastroenterology & Hepatology, Department of Health Promotion Sciences Maternal and Infant Care, Internal Medicine and Medical Specialties, PROMISE, University of Palermo, Palermo, Italy
2. Department of Surgical, Oncological, and Oral Sciences, University of Palermo, Palermo, Italy
3. Department of Medical Sciences, University of Pavia, Pavia, Italy
4. Division of Gastroenterology and Hepatology, IRCCS Foundation, Ca'Granda Ospedale Maggiore Policlinico of Milan, Milan, Italy